Pipe-lifter.



No. 877,282 PATENTED JAN.21,1908. B. J. ANDERSON & s. HANSON.

PIPE LIFTER. APPLICATION FILED JUNE 4. 1906.

rn: Mann]: PITERICIZ, wAsnmu'mu, nc EMIL J. ANDERSON AND SEVERT HANSON, OF HOUSTON, MINNESOTA.

PIPE-LIFTER.

Specification of Letters Patent.

Application filed June Q 1906. Serial No. 320,086.

Patented 'Jan. 21, 1908.

To all whom it may concern:

Be it known that we, EMIL J. ANDERSON and SEVERT HANSON, citizens of the United States, residing at Houston, in the county of Houston and State of Minnesota, have invented certain new and useful Improvements in Pipe-Lifters, of which the following is a specification.

Our invention relates to improvements in pipe lifters, its object being to provide simple and efficient means for raising and lowering the pipe or pipe-sections in wells and the like. To that end the invention consists in the construction, combination and arrangement of parts hereinafter described and claimed.

In the accompanying drawings forming part of this speclfication, Figure 1 is a perspective view of the improved pi e lifter, and Fig. 2 is a horizontal section on -ne w-0c of Fig. 1.

In Fig. 1 of the drawings is shown partly broken away the lower'or suspended pulley block 2' of a hoisting tackle. From this block is suspended a hook 3, the ring 4 of the hook passing through the strap 5 of the block.

The lifter proper comprises a U-shaped pipe-embracing strap 6, the arms of which are interspaced a sufficient distance to receive between them the pipe 7 to be lifted. Pivotally mounted between the strap-arms upon a pin or pivot 8 passing through these arms is a clamping-head 9 having at its rear end an arm 10 to which isconnected a link 11 through which may be inserted the hook 3 of the hoisting tackle.

The clamping head 9 is preferably elliptical or elongated in shape and is fulcrumed eccentrically upon the pivot pin 8 which passes through a hole 12 in the clamping head so positioned as to leave sufficient clearance between the front end of the head and the U-bend of the strap 6 to accommodate the pipe to be lifted. The clamping head is formed, preferably, with a plurality of pivot holes 12 whereby the position of the pivot in the head may be adjusted and the amount of clearance regulated, but it has its center of gravity forward of any of the pivot holes. The clearance may also be regulated by pulling or slacking the trip-rope whereby the clamping head will be turned upon the pivot 8 towards or away from the pipe.

Connected with the forward part of the clamping head is a ring 13 to which is secured one end of a trip-cable 14, the other end leading up over the lower block of the hoisting tackle, or some convenient part connected therewith, and down to a point near enough to the ground to be manipulated by the workmen. In the drawings the rope is shown led through the ring 4 of theihook 3.

In operation, when it is desired to raise or lower the lifter without at the same time raising or lowering the pipe, the ropel l is pulled to raise the clamping-head out of engagement with the pipe, as shown in full lines in the drawings. Then, by hoisting the block 2.

and the rear end of the clamping head suspended therefrom as described, and at the same time kee ing the trip-rope taut, the entire lifter, inc uding clamping head and U- strap may be moved up or down the pipe without wedging.

When it is desired to raise or lower the pipe, the lifter is first adjusted in the manner above described to the desired position upon the pipe. Then the trip rope is released. The clamping head is formed with its center of gravity forward of its pivotal connection with the strap, so that, when the trip ro e is released, the clamping-head will drop own under gravity into engagement with the pi e 7 and clamp the pipe against the U-bend o the strap 6, as shown in the dotted lines in the drawings. The weight of the pipe will tend further to turn the clamping head by reason of its frictional contact therewith, and thus increase the clamping pressure of clampinghead and strap. The pipe and lifter may then be raised or lowered together by operating the hoisting tackle.

It is obvious that modifications may be made in the details of the device without departing from the principle of the invention, the S00 e of which is defined in the claims.

We 0 aim as our invention:

In a 'pipe lifter, the combination, with hoisting tackle having a suspended portion adapted to support a cable, of a U-shaped pi e-embracing strap, a clamping head eccentrlcally pivoted within the arms of the strap, means for connecting the rear end of the clamping head with the hoisting tackle, and a trip-cable connected with the forward part of the clamping head and passing over said suspended portion of the hoistin tackle, the

In testimony whereof we affix our sigmastrap being formed with a plura ity of pivot tures in presence of two Witnesses.

holes whereby the position of the pivot in the head may be adjusted and the amount of clearance for the pipe regulated, and the clamping head having its center of gravity forward of its point of pivotal connection with the strap.

EMIL J. ANDERSON. SEVERT HANSON.

Witnesses E. CAnLsoN, JOHN NELSON. 

